云开发demo里面添加数据

• 当前 Bug 的表现（可附上截图）[数据库] [新增记录] 失败： Error: errCode: -1  | errMsg: collection.add:fail operateWXData:fail system error; at collection.add api;
      at new t (WACloud.js:1)
      at u (WACloud.js:1)
      at Object.t.returnAsFinalCloudSDKError (WACloud.js:1)
      at t.<anonymous> (WACloud.js:1)
      at WACloud.js:1
      at Object.throw (WACloud.js:1)
      at o (WACloud.js:1)
      at <anonymous>

• 预期表现

• 复现路径

• 提供一个最简复现 Demo

官方demo